private void multiSelectTreeview1_ItemDrag(object sender, ItemDragEventArgs e)
 {
     treeview = (MultiSelectTreeview)sender;
     multiSelectTreeview1.DoDragDrop(e.Item, DragDropEffects.Move | DragDropEffects.Copy);
 }
 private void multiSelectTreeview1_ItemDrag(object sender, ItemDragEventArgs e)
 {
     treeview = (MultiSelectTreeview) sender;
     multiSelectTreeview1.DoDragDrop(e.Item, DragDropEffects.Move | DragDropEffects.Copy);
 }